Śrī Caitanya-caritāmṛta Madhya-līlā Chapter 8 Text 74

TRANSLATION
Hearing this from Rāmānanda Rāya, the Lord again requested him to go a step further. In reply, Rāmānanda Rāya said, “Loving service to Kṛṣṇa rendered in fraternity is the highest perfection.